@article{MZM_2014_96_4_a13,
     author = {N. K. Makina and \'E. A. Nazirova and Ya. T. Sultanaev},
     title = {On the {Methods} of {Study} of the {Asymptotic} {Behavior} of {Solutions} of {Singular} {Differential} {Equations}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {627--632},
     publisher = {mathdoc},
     volume = {96},
     number = {4},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2014_96_4_a13/}
}